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Now Playing: 02-07-2012 Marketplace

The U.S. is now 81 percent self-sufficient when it comes to energy. Congress passed legislation that will open up more of the sky to unmanned aircrafts. Federal Reserve Chairman Ben Bernanke testified to the Senate today on his outlook for the economy. What happens to a super PAC whose candidate pulls out of the race? Health reporter Gregory Warner explores the problems with hospital readmissions. And Kai Ryssdal talks to Patricia Cohen about her new book on the middle age.